CarAC not blowing air from vents because of the following:

(1) Blower fan problem.
(2) Airduct blockage.

First off, we need to clear something up. The "blower" and the "fan" are the same things. We used the word "fan" in the problem description because it's a more familiar term. The official name for it (as used by mechanics) is "blower". Now then, it should be obvious that if the air isn't blowing from the vents at any fan/blower setting, the blower must not be working. Two common causes of this are.

Blown Fuse - Like most electrical devices, the blower has a fuse as part of its circuit. This fuse can "pop" for one reason or another. This will immediately cause the blower to stop working.

Failed Blower Motor - The blower motor is the heart of the blower and, as one might guess, it drives the blower wheel which in turn, blows air. Of course then, if the blower motor has failed, the blower won't work. Another possible, but rare, cause of an inoperative blower is a faulty dashboard fan/blower switch.

Same as when there is air duct blockage it will restrict the flow of air from coming out of the car air conditioning vent, the reason for this is because of the closed or nearly closed air doors that are stuck inside of one of the air conditioning ducts preventing enough amount of air from coming out the car ac vents, it is also possible that an accumulation of debris like leaves from a fresh air intakes restricts airflow from going into air duct all the way to the air vents, but the restriction of air will only be felt when the car air conditioning is set to "fresh". The other possibility is that one or more of the air doors (inside the ducts) is stuck in a closed or nearly closed position, thus restricting airflow.

What will you do?

First off, locate this vehicle's fuse box. Refer to the owner's manual if you aren't sure where it's located. Once you've found the box, find the particular fuse that is associated with the blower (it should be labeled either "Heater" or "A/C"). Examine this fuse to see if it has blown. If so, replace it with a fuse that has an identical amperage rating (refer to owner's manual for this information). If the blower works but then fails again, there is likely a short circuit somewhere. You'll need professional assistance in this case.

If the fuse was intact, you likely have a failed blower motor or a problem with the switch's wiring. Take this vehicle to a qualified mechanic for inspection and repair. Try to find a mechanic that specializes in A/C and heater repair.

Air conditioner airflow is weak

If air barely blows out or the air conditioner airflow is weak even with fans at the highest setting, it indicates a problem with the blower or physical blockage of ducts. Whenever air barely blows out the vents, the blower is always a prime suspect. In particular, the blower motor may be failing or the blower wheel may be slipping from the blower motor shaft.

Another possibility is that the blower will only operate at it's the lowest speed, regardless of which setting it's on. For example, even when the blower/fan is on its highest setting, it sounds like it's on its lowest setting. This is caused by a faulty dashboard blower/fan switch assembly (specifically, loose wires or bad resistors).

If it occurs in a fresh setting

If the problem occurred only when the air circulation is set to "fresh", meaning the air from outside goes inside the vehicle then it obviously be a problem of accumulation of debris on the intake port for fresh air, check if there is leaves that accumulates on the intake port that restrict the flow of air from coming out vents, remove that debris to solve the problem, the intake port is located on the outside beneath the cowl top, this is near the windshield base, just open the car hood to gain full access on the intake port.

If the problem occurs on either re-circulation or fresh setting
Sometimes it's just a case of blocked or dirty AC filter, check the cabin air filter for any debris and clean or replace if necessary.

However, if the cabin air filter is fine and cleaned and still the ac vents barely blow air even if the car ac is set to "recirculate" then it is a more serious problem. In this case, you need a mechanic to check the problem, bring the car to a reputable shop specializing in auto ac repair and have it check.

Probably the mechanic will remove lots of parts before the car ac blower and air conditioning checked, this has to be done to give way on the checking of the AC duct. In checking these parts it needs some expertise of the mechanic so a car shop that specializes in AC repair is necessary.

What will you do?

First, check the fresh-air intake port for leaves/debris which may be blocking it. This port is located on the outside of the vehicle near the base of the windshield. you may have to open the hood to get full access to its ductwork maybe possible. As was mentioned in the explanation for this diagnosis, blockage of this port will only affect the system when it's set to "fresh".

However, if air barely blows out the vents even when the system is set to "recirculate", you've got a more serious situation than that of a simple leaves/debris buildup. In this case, you'll need to take the car to a mechanic who has some expertise in the area of auto A/C and heater systems. Unfortunately, the mechanic will (in most cases) need to tear apart the dashboard in order to get at the blower and the various ducts of the system. Good luck.

Car Heater Not Blowing Hot Air

An automatic temperature control system uses an on-board computer to maintain a constant passenger compartment temperature (as set by the driver).

21 comments:

HI, I have a 2005 kia spectra5, my a/c unit works, but sometimes when Im driving the airflow stops. If I put my hand up to the vent, I feel the cold air inside the duct but there is no airflow and the fan sounds like is working. Also sometimes I see a white cloud of fog, almost like when you open your freezer. I dont know what could be causing this, but I think is freezing the duct and restricting the airflow because when this happens, Ill put the temperature to hot, and it takes a few minutes before the hot air starts flowing causing the air to flow again. Any Ideas or suggestions?

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